| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.hadoop.mapred; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| |
| /** |
| * Expert: Generic interface for {@link Mapper}s. |
| * |
| * <p>Custom implementations of <code>MapRunnable</code> can exert greater |
| * control on map processing e.g. multi-threaded, asynchronous mappers etc.</p> |
| * |
| * @see Mapper |
| * @deprecated Use {@link org.apache.hadoop.mapreduce.Mapper} instead. |
| */ |
| @Deprecated |
| @InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public interface MapRunnable<K1, V1, K2, V2> |
| extends JobConfigurable { |
| |
| /** |
| * Start mapping input <tt><key, value></tt> pairs. |
| * |
| * <p>Mapping of input records to output records is complete when this method |
| * returns.</p> |
| * |
| * @param input the {@link RecordReader} to read the input records. |
| * @param output the {@link OutputCollector} to collect the outputrecords. |
| * @param reporter {@link Reporter} to report progress, status-updates etc. |
| * @throws IOException |
| */ |
| void run(RecordReader<K1, V1> input, OutputCollector<K2, V2> output, |
| Reporter reporter) |
| throws IOException; |
| } |